test: add queue tests

Signed-off-by: Jérôme Benoit <jerome.benoit@sap.com>

diff --git a/tests/queue.test.js b/tests/queue.test.js
new file mode 100644 (file)
index 0000000..9321110
--- /dev/null
+++ b/tests/queue.test.js
@@ -0,0 +1,51 @@
+const { expect } = require('expect')
+const { Queue } = require('../lib/queue')
+
+describe('Queue test suite', () => {
+  it('Verify enqueue() behavior', () => {
+    const queue = new Queue()
+    let rtSize = queue.enqueue(1)
+    expect(queue.size).toBe(1)
+    expect(rtSize).toBe(queue.size)
+    expect(queue.head).toBe(0)
+    expect(queue.tail).toBe(1)
+    expect(queue.items).toStrictEqual({ 0: 1 })
+    rtSize = queue.enqueue(2)
+    expect(queue.size).toBe(2)
+    expect(rtSize).toBe(queue.size)
+    expect(queue.head).toBe(0)
+    expect(queue.tail).toBe(2)
+    expect(queue.items).toStrictEqual({ 0: 1, 1: 2 })
+    rtSize = queue.enqueue(3)
+    expect(queue.size).toBe(3)
+    expect(rtSize).toBe(queue.size)
+    expect(queue.head).toBe(0)
+    expect(queue.tail).toBe(3)
+    expect(queue.items).toStrictEqual({ 0: 1, 1: 2, 2: 3 })
+  })
+
+  it('Verify dequeue() behavior', () => {
+    const queue = new Queue()
+    queue.enqueue(1)
+    queue.enqueue(2)
+    queue.enqueue(3)
+    let rtItem = queue.dequeue()
+    expect(queue.size).toBe(2)
+    expect(rtItem).toBe(1)
+    expect(queue.head).toBe(1)
+    expect(queue.tail).toBe(3)
+    expect(queue.items).toStrictEqual({ 1: 2, 2: 3 })
+    rtItem = queue.dequeue()
+    expect(queue.size).toBe(1)
+    expect(rtItem).toBe(2)
+    expect(queue.head).toBe(2)
+    expect(queue.tail).toBe(3)
+    expect(queue.items).toStrictEqual({ 2: 3 })
+    rtItem = queue.dequeue()
+    expect(queue.size).toBe(0)
+    expect(rtItem).toBe(3)
+    expect(queue.head).toBe(0)
+    expect(queue.tail).toBe(0)
+    expect(queue.items).toStrictEqual({})
+  })
+})